JP3753615B2 - Plastic film LCD electrical connection structure and connection method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention electrically connects a plastic film liquid crystal display (LCD) used in a small electronic device such as a mobile phone, a PDA (Personal Digital Assistance), a digital still camera, and a substrate housed in the small electronic device. The present invention relates to a connection structure and a connection method.
[0002]
[Prior art]
Conventionally, the following methods are known for connecting a liquid crystal display device (LCD) to a printed wiring board.
[0003]
First, a flexible wiring board or flexible flat cable (hereinafter collectively referred to as FPC) is connected to the LCD by thermocompression bonding (ACF connection), and the other end of the FPC is soldered to the printed board in advance. This is a method of connecting to the FPC connector.
[0004]
The second is a method of connecting by using an elastomer connector and pressing it with a metal fitting for fixing the LCD.
[0005]
The third is a method of connecting by an LCD electrical connection connector (refer to Japanese Patent Application Nos. 11-212405 and 11-278390) having conductive contacts proposed by the present inventors. .
[0006]
[Problems to be solved by the invention]
However, the above-described first method has a problem that the yield is high during FPC thermocompression bonding, resulting in an increase in cost.
[0007]
Further, the second method described above has a problem that a short circuit between the substrate patterns is likely to occur, and that the elastomer connector has poor durability against a change in dimensions due to a temperature change or the like.
[0008]
Further, in the third method, when pressure is concentrated on one point of the electrode pattern in connection with a relatively soft LCD such as a plastic film LCD, the electrode pattern may be damaged due to distortion of the plastic film LCD. There is a problem.
[0009]
Therefore, the first technical problem of the present invention is that the LCD and the printed circuit board can be connected without thermocompression bonding of the FPC, so that the yield is good and the LCD can be easily replaced. An object of the present invention is to provide an electrical connection structure and a connection method for a plastic film LCD.
[0010]
In addition, a second technical problem of the present invention is to provide an electrical connection structure between a substrate and a plastic film LCD, which can absorb a change in dimensions due to a temperature change or the like and obtain a stable connection, and a connection method. There is.
[0011]
In addition, the third technical problem of the present invention is that the pressure does not concentrate on one point of the electrode pattern of the plastic film LCD, and that the pattern can be prevented from being damaged. And to provide.
[0012]
A fourth technical problem of the present invention is to provide an electrical connection structure and a connection method between a substrate and a plastic film LCD, which can obtain a stable connection with a large contact area.
[0013]
[Means for Solving the Problems]
According to the present invention, the substrate used in a portable electronic device including a substrate on which electronic components are mounted, a plastic film LCD, and a first housing and a second housing that house these, and the In a plastic film LCD electrical connection structure for electrical connection with a plastic film LCD, the substrate includes a first connection part for electrical connection and is accommodated in the first housing, and the plastic film LCD is A second connecting portion for electrical connection; a pressing member that presses the first and second connecting portions against each other; and a second pressing member that is detachably held on the second housing. and a holding portion, the pressing member has a pair of guide portions together comprises a pressing spring made of a metal piece, and the insulator for holding the pressing spring, Serial holding member has a pair of guide grooves at positions corresponding to the pair of guide portions, when assembled with said first and second housings, the pressing member and the first and second of the one connection portion or by pressing the vicinity of, and with the first connecting portion and the second connecting portion is configured to electrically connect, the pressing member, the first and second connecting portions And is detachably held in the second casing by sliding in the direction intersecting the pressing direction of the first and second connecting portions. A plastic film LCD electrical connection structure is obtained.
[0015]
Further, according to the present invention, before Kipu Las plastic film LCD electrical connection, wherein at least one of the first and second connecting portions, plastics, comprising the flexible wiring board or a flexible flat cable A film LCD electrical connection structure is obtained.
[0016]
Further, according to the present invention, before Kipu Las plastic film LCD electrical connection, said first and second connecting portions is an electrode pattern formed on the substrate and the one surface of each of the plastic film LCD A plastic film LCD electrical connection structure is obtained.
[0017]
In addition, according to the present invention, the substrate used in a portable electronic device including a substrate on which electronic components are mounted, a plastic film LCD, and a first housing and a second housing that accommodate these. In the plastic film LCD electrical connection method for electrically connecting the plastic film LCD and the plastic film LCD, the substrate is provided with a first connection part for electrical connection and accommodated in the first housing, and the plastic film The LCD is provided with a second connecting portion for electrical connection, a pressing spring made of a metal piece is held on the insulator, a pair of guide portions is provided, and the first and second connecting portions are pressed against each other. member via a pair of guide grooves provided in a position corresponding to the pair of guide portions on the second housing and detachably held, the first and second When assembled and a housing, the pressing member presses the one connection portion or in the vicinity thereof, the first connection portion and the second connecting portion electrically connected to the pressing member to the guide groove By inserting the guide portion, the first and second connection portions are locked and positioned in the pressing direction , and the first and second connection portions are slid in a direction intersecting with the pressing direction. by moving, plastic film LCD electrical connection wherein the detachably retained in the second housing is obtained.
[0019]
Further, according to the present invention, before Kipu Las plastic film LCD electrical connection method, as at least one of said first and second connecting portions, the plastic, which comprises using a flexible wiring board or a flexible flat cable A film LCD electrical connection method is obtained.
[0020]
Furthermore, according to the present invention, before the Kipu Las plastic film LCD electrical connection method, as the first and second connecting portions, used after forming an electrode pattern on the substrate and the one surface of each of the plastic film LCD A plastic film LCD electrical connection method is obtained.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
[0022]
FIG. 1 is a perspective view for explaining a plastic film LCD electrical connection structure according to a first embodiment of the present invention. FIG. 2 is an exploded perspective view of the electrical connection structure of FIG.
[0023]
Referring to FIGS. 1 and 2, the plastic film LCD electrical connection structure is a structure for electrically connecting the printed circuit board 5 of an electronic device on which electronic components are mounted and the plastic film LCD 4. The printed circuit board 5 is accommodated in a housing (hereinafter referred to as a first housing) of an electronic device (not shown).
[0024]
An FPC connector 6 is provided on a part of the printed circuit board 5 of the electronic device. The FPC connector 6 is provided with a flexible wiring board or a flexible flat cable (hereinafter referred to as FPC) 3 to which one end is connected, and an electrode as a first connection portion is provided on one surface of the other end. A pattern 3a is formed.
[0025]
On the other hand, an electrode pattern 4a is formed at one end of the plastic film LCD 4 as a second connection portion.
[0026]
The printed circuit board 5 and the plastic film LCD 4 are connected to each other via a flexible wiring board or a flexible flat cable (hereinafter referred to as FPC) 3.
[0027]
Referring to FIG. 2, in order to connect the printed circuit board 5 and the plastic film LCD 4, the printed circuit board 5, the plastic film LCD 4, and the FPC 3 are stacked in this order. At this time, the electrode pattern 4a as the second connection portion of the plastic film LCD4 and the electrode pattern 3a of the FPC3 as the first connection portion are overlapped, and the other end of the FPC3 is FPC soldered to the printed circuit board 5 in advance. 1 is inserted into the connector 6 and the other end of the FPC 3 is pressed against the electrode portion 4a of the other end of the plastic film LCD 4 so that the contact portion 1c of the pressing spring 1 of the pressing member 10 is on the lower side. Thus, the printed circuit board 5 and the plastic film LCD 4 are electrically connected.
[0028]
FIGS. 3A and 3B are views for explaining the pressing member of the connection structure of FIG. 1, in which FIG. 3A is a perspective view seen from the upper surface side, and FIG. 3B is a perspective view seen from the bottom surface side. FIG. 4 is a top view showing the pressing member of FIGS. 3 (a) and 3 (b). FIG. 5 is a front view showing the pressing member of FIGS. 3 (a) and 3 (b).
[0029]
Referring to FIGS. 3A and 3B to FIG. 5, the pressing member 10 includes a U-shaped insulator 2 and a pressing spring composed of a metal piece having a substantially L-shaped spring property attached to the insulator 2. 1 is provided.
[0030]
The insulator 2 has a rectangular recess 2c cut inwardly from the front side, and is cut into the front of the recess 2c corresponding to the pressing spring 1 from one side of the insulator 2. The cut groove 2b and the holding hole 2a are provided.
[0031]
A plurality of pressing springs 1 are arranged at intervals along the length direction of the insulator 2. Each of the pressing springs 1 includes a base portion 1b mounted in the holding hole 2a of the insulator 2 in the horizontal direction, and a contact portion that bends from the base portion 1b to the bottom surface side of the insulator 2 and extends obliquely on the bottom surface of the insulator 2. 1c.
[0032]
FIG. 6 is a diagram for explaining the mounting operation of the pressing member 10 shown in FIGS. FIG. 7 is a view showing a state in which the pressing member 10 is mounted. Referring to FIG. 6, a pressing member fixing portion 7 a protruding in a U shape is formed on one surface of a housing (hereinafter referred to as a second housing) 7. The pressing member fixing portion 7a is formed with a guide groove 7b that is open at one end and engages with the guide portions 2d and 2e of the pressing member. And is fixed to the inner surface of the second casing 7 as shown in FIG.
[0033]
8 and 9 are cross-sectional views provided for explaining the connection operation of the plastic film LCD 4, and are cross-sectional views taken along the line AA in FIG.
[0034]
As shown in FIG. 8, one end of the FPC 3 is connected to the FPC connector 6 provided on the printed circuit board 5, and the other surface is overlapped on the plastic film LCD 4 placed on the printed circuit board 5. It is done. At this time, the electrode pattern 3a on the bottom surface of the FPC 3 and the electrode pattern 4a on the bottom surface of the plastic film LCD 4 are overlapped. Here, the pressing member 10 is attached to the second casing 7 by inserting the insulator 2 into the pressing member fixing portion 7a, and is fixed to the second casing 7 with screws or the like.
[0035]
As shown in FIG. 9, the pressing member 10 fixed to the pressing member fixing portion 7 a of the second casing 7 by the overlapping of the second casing 7 is caused by the contact portion 1 c of the pressing spring 1 of the FPC 3. The electrode pattern 3a is pressed toward the electrode pattern 4a of the printed circuit board from the opposite side of the surface on which the electrode pattern 3a of the FPC 3 is formed, and the electrode pattern 4a of the plastic film LCD 4 and the electrode pattern 3a of the FPC 3 are in contact with each other for electrical connection Is done.
[0036]
Since the connected electrode patterns 3 a and 4 a are connected by the spring force of the pressing spring 1 of the pressing member 10, the plastic film LCD 4 can be easily lifted by lifting the seventh housing 7 and releasing the pressing member 10. And has durability against dimensional changes in the vertical direction due to temperature changes and the like.
[0037]
Further, since the pressing spring 1 of the pressing member 10 does not directly contact the electrode pattern 4a of the plastic film LCD 4, the pressure does not concentrate on one point of the electrode pattern 4a, and the pattern can be prevented from being damaged.
[0038]
Furthermore, since a wide range of patterns are brought into contact with each other, a stable connection with a large contact area can be obtained.
[0039]
FIG. 10 is a diagram for explaining one example of use of the plastic film LCD electrical connection structure according to the first embodiment of the present invention, and FIG. 11 shows the main part of the plastic film LCD electrical connection structure used in FIG. FIG.
[0040]
As shown in FIGS. 10 and 11, the mobile phone 20 as an electronic device includes a first housing 8 and a second housing 7 that are coupled to each other. A pressing member is attached to the fixing portion 7 a on the inner surface of the second housing 7. A printed circuit board 5 in the first housing 8 and a plastic film LCD 4 are provided. One end is attached to the FPC connector 6 provided on the printed circuit board 5, and the other end is overlapped with the plastic film LCD 4. When these first and second casings 8 and 7 are closed, the pressing spring 1 of the pressing member 10 presses one end of the FPC 3 and the printed circuit board 5 and the plastic film LCD 4 are electrically connected.
[0041]
FIG. 12 is a cross-sectional view showing a plastic film LCD connection structure according to the second embodiment of the present invention. As shown in FIG. 12, the electrode pattern 4 a of the plastic film LCD 4 as the second connection portion is in direct contact with the conductor pattern 5 a of the printed circuit board 5 as the first connection portion, and the second casing 7 is contacted. The provided pressing springs 1 can press on this to obtain mutual contact.
[0042]
In the above embodiment, the cellular phone has been described as an example. However, the present invention is not limited to this cellular phone, and may include first and second casings and a plastic film LCD. Obviously, it can be used for any small electronic device.
[0043]
【The invention's effect】
As described above, according to the present invention, since the LCD and the printed circuit board can be connected without thermocompression bonding of the FPC, the yield is good, and the plastic film LCD electrical connection structure can be easily replaced. And a connection method can be provided.
[0044]
In addition, according to the present invention, since the structure is connected by pressing using a pressing spring, it is connected to a plastic film LCD electrical connection structure that can absorb a change in dimensions due to a temperature change and obtain a stable connection. A method can be provided.
[0045]
In addition, according to the present invention, since the structure is pressed from above the FPC placed on the electrode pattern of the plastic film LCD, pressure is not concentrated on one point of the electrode pattern of the plastic film LCD, thereby preventing the pattern from being damaged. There can it to provide a a connection plastic film LCD electrical connection that can be.
[0046]
Further, according to the present invention, since a wide range of patterns of the plastic film LCD and the FPC are brought into contact with each other, it is possible to provide a plastic film LCD electrical connection structure and a connection method capable of obtaining a stable connection with a large contact area. .
[Brief description of the drawings]
FIG. 1 is a perspective view for explaining a plastic film LCD electrical connection structure according to a first embodiment of the present invention;
FIG. 2 is an exploded perspective view of the connection structure of FIG.
FIGS. 3A and 3B are views used for explaining the pressing member of the connection structure of FIG. 1, wherein FIG. 3A is a perspective view viewed from the upper surface side, and FIG. 3B is a perspective view viewed from the bottom surface side;
4 is a top view showing the pressing member of FIGS. 3 (a) and 3 (b). FIG.
5 is a front view showing the pressing member of FIG. 3; FIG.
6 is a diagram for explaining the mounting operation of the pressing member 10 shown in FIGS. 3 to 5; FIG.
7 is a view showing a state in which a pressing member 10 is mounted. FIG.
8 is a cross-sectional view for explaining the connection operation of the plastic film LCD4, and is a cross-sectional view taken along a line AA in FIG.
9 is a cross-sectional view for explaining the connection operation of the plastic film LCD 4 and is a cross-sectional view taken along a line AA in FIG.
FIG. 10 is a diagram which is used for describing an example of use of the plastic film LCD electrical connection structure according to the first embodiment of the present invention.
11 is an exploded perspective view showing the main part of the connection structure used in FIG.
FIG. 12 is a sectional view showing a plastic film LCD electrical connection structure according to a second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pressing spring 1c Contact part 2 Insulator 2a Holding hole 2b Cut groove 2c Recessed part 2e Guide part 3 FPC
3a Electrode pattern 4 Plastic film LCD
4a Electrode pattern 5 Printed circuit board 6 FPC connectors 7, 8 Housing 7a Press member fixing part 10 Press member

Claims (6)

Electrically connecting the substrate and the plastic film LCD used in a portable electronic device including a substrate on which an electronic component is mounted, a plastic film LCD, and a first housing and a second housing for housing them. In the electrical connection structure for plastic film LCD for connection, the substrate includes a first connection part for electrical connection and is accommodated in the first housing, and the plastic film LCD is electrically connected to the first electrical connection structure. A pressing member that presses the first and second connecting portions together, and a holding portion that is provided to detachably hold the pressing member on the second housing. , the pressing member has a pair of guide portions together comprises a pressing spring made of a metal piece, and the insulator which holds the pressure spring, the holding member, A pair of guide grooves at positions corresponding to the serial pair of guide portions, when assembled with said first and second housings, one connection portion of the pressing member of said first and second Alternatively, by pressing the vicinity thereof, the first connection portion and the second connection portion are configured to be electrically connected, and the pressing member is in a direction of pressing the first and second connection portions. It is locked and positioned, and slides in a direction crossing the direction in which the first and second connection portions are pressed , and is detachably held by the second casing. Plastic film LCD electrical connection structure. 2. The plastic film LCD electrical connection structure according to claim 1 , wherein at least one of the first and second connection portions is composed of a flexible wiring board or a flexible flat cable. . 2. The plastic film LCD electrical connection structure according to claim 1 , wherein the first and second connection portions are electrode patterns formed on one surface of each of the substrate and the plastic film LCD. Film LCD electrical connection structure. Electrically connecting the substrate and the plastic film LCD used in a portable electronic device having a substrate on which electronic components are mounted, a plastic film LCD, and a first housing and a second housing for housing these. In the electrical connection method of the plastic film LCD for connection, the substrate is provided with a first connection part for electrical connection and accommodated in the first casing, and is electrically connected to the plastic film LCD. Providing a second connection,
A pressing spring made of a metal piece is held on the insulator, a pair of guide portions is provided, and a pressing member that presses the first and second connection portions together corresponds to the second housing with the pair of guide portions Removably held through a pair of guide grooves provided at a position to
When the first and second housings are assembled, the pressing member presses one connection portion or the vicinity thereof to electrically connect the first connection portion and the second connection portion,
By inserting the guide part into the guide groove, the pressing member is locked and positioned in the pressing direction of the first and second connection parts, and the first and second connection parts are pressed. A plastic film LCD electrical connecting method, wherein the plastic film LCD is slidably held in the second casing by sliding in a direction intersecting with the direction of the plastic film LCD. 5. The plastic film LCD electrical connection method according to claim 4 , wherein a flexible wiring board or a flexible flat cable is used as at least one of the first and second connection portions. . 5. The plastic film LCD electrical connection method according to claim 4 , wherein the first and second connection portions are formed by forming electrode patterns on one surface of each of the substrate and the plastic film LCD. Plastic film LCD electrical connection method.

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